import javax.print.DocFlavor;
import java.util.Deque;
import java.util.LinkedList;
import java.util.PriorityQueue;
import java.util.Queue;

public class Demo5 {
    public static void main(String[] args) {
        Deque queue=new LinkedList();
        LinkedList<Integer>linkedList=new LinkedList<>();


    }
}
